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General DescriptionThe MAX2361 evaluation kit (EV kit) simplifies testing ofthe MAX2361/MAX2363/MAX2365. The EV kit provides50Ω SMA connectors for all RF inputs and outputs. Avaractor-based tank circuit is provided for the on-chipvoltage-controlled oscillator (VCO) and phase lockedwith an on-chip PLL. I/Q baseband inputs come withstandard BNC connectors.
The EV kit allows evaluation of the MAX2361/MAX2363/MAX2365s’ I/Q modulator, IF VGA, RF upconverter,dual-band IF VCOs, dual synthesizer, 3-wire program-ming interface, and power-management features.
The MAX2363W EV kit is for evaluation of the MAX2363for single band WCDMA.
Features On-Board PCS and Cellular VCOs
50Ω SMA Connectors on All RF Ports
BNC Connectors for Baseband Inputs
Low-Power Shutdown Mode
PC Control Software Available at www.maxim-ic.com
SPI™/QSPI™/MICROWIRE™ Compatible
WCDMA Option (MAX2363WEVKit)
19-2013; Rev 2; 5/01
Ordering Information
MAX2361 Component List
SPI and QSPI are trademarks of Motorola, Inc.MICROWIRE is a trademark of National Semiconductor Corp.
PART TEMP. RANGE IC PACKAGE
MAX2361EVKIT -40°C to +85°C 48 QFN-EP* MAX2363WEVKIT -40°C to +85°C 48 QFN-EP*
Quick StartThe MAX2361/MAX2363W EV kits are fully assembledand factory tested. Follow the instructions in theConnections and Setup section.
Test Equipment RequiredThis section lists the recommended test equipment toverify the operation of the MAX2361/MAX2363/MAX2365. It is intended as a guide only, and substitu-tions may be possible.
• One TCXO (Temperature-Components CrystalOscillator) at 19.68MHz for the PLL reference fre-quency
• An RF spectrum analyzer with optional digital modu-lation personality (Rohde & Schwarz FSEA30 orequivalent)
• A power supply that can provide 250mA at +3.3V
• A power supply that can provide 50mA at +5V
• An additional voltage source for control of VGA func-tions
• I/Q arbitrary waveform generator or CDMA generator
(Agilent E4433B or equivalent)
• PC (486DX33 or better) with Win95®/98®, Win2000®,WinNT® 4.0 or later operating system and an avail-able parallel port
• INTF2300 interface board (supplied with EV kit)
Connections and SetupThis section provides step-by-step instructions for get-ting the EV kit up and running in cellular and PCSCDMA modes.
Cellular CDMA ModePerform the following steps to evaluate the MAX2361 inthe cellular CDMA mode:1) Verify shunts JU1, JU2, and JU6–JU10 are in place.2) Connect the INTF2300 interface cable as shown in
Figure 8. Note: Pin 1 of the interface cable corre-sponds to the red wire. Pin 1 is designated insilkscreen on each of the PC boards.
3) Connect a +3.0V power supply to VBAT. TheINTF2300 board derives its power from the MAX2361EV kit.
4) Connect a +5.0V power supply to the header labeled“+5V”.
5) Connect the TCXO to the REF port.6) Connect a CDMA baseband signal generator to the
I and Q ports using BNC connectors. Set the modu-lation to reverse-channel CDMA
7) Install and run Maxim CDMA control software.Software is also available on the web atwww.maxim-ic.com. On the IC selection form, clickon the MAX236X control button. Select P4. Click onregister views.
8) With the MAX236X control screen active, set the reg-isters according to Table 1.
9) Click on the Send Data button for each of the con-trol registers located at the right of the screen.There are eight registers that need to be down-loaded to the IC. The Lock indicator on the screen(and on the EV board) should be red, indicatinglock.
10) Apply 2.4V to GC via JU4.11) Connect RFL to the spectrum analyzer. Configure
the spectrum analyzer to measure ACPR forreverse-channel CDMA. Set the center frequency to836MHz with a +10dBm reference level.
12) The output power should be about +9dBm afteraccounting for cable and connector loss. The ACPRat ±885kHz offset should be -54dBc, and the ACPRat ±1.98MHz offset should be -65dBc.
Component Suppliers
MAX2363W Component List(continued)
Win95®/98®, Win2000®, WinNT® are registered trademarks ofMicrosoft Corp.
Note: Please indicate that you are using the MAX2361/MAX2363W when contacting these component suppliers.
Upper Half-Band PCS CDMA ModePerform the following steps to evaluate the MAX2361 inthe PCS CDMA mode:
1) Remove shunt JU2 and place shunt in JU3. Thisremoves VCC for the cellular VCO and applies VCCto the PCS VCO.
2) With the MAX236X control screen active, set theregisters according to Table 1.
3) Click on the Send Data buttons for each of the con-trol registers located at the right of the screen.There are eight registers that need to be down-loaded to the IC. The lock indicator on the screenshould be red, indicating lock.
4) Apply a 2.4V to VGC via JU4.
5) Connect the RFH0 port to the spectrum analyzer.Configure the spectrum analyzer to measure ACPRfor reverse-channel CDMA. Set the center frequen-cy to 1880.01MHz with a +10dBm reference level.
6) The output power should be about +9dBm afteraccounting for cable and connector loss. The ACPRat ±1.25MHz offset should be -54dBc.
Wide-Band CDMA ModePerform the following steps to evaluate the MAX2363 inthe wideband CDMA mode:
1) Remove shunt JU2 and place shunt in JU3. Thisremoves VCC for the cellular VCO and applies VCCto the WCDMA VCO.
2) Connect a TCXO at 15.36MHz to REF port.
3) Set the modulation of the baseboard signal genera-tor to 3GPP WCDMA reverse link.
4) With the MAX236X control screen active, set theregisters according to Table 1.
5) Click on the Send Data buttons for each of the con-trol registers located at the right of the screen.There are eight registers that need to be down-loaded to the IC. The Lock indicator on the screenshould be red, indicating lock.
6) Apply a 2.4V to VGC via JU4.
7) Connect the RFH0 port to the spectrum analyzer.Configure the spectrum analyzer to measure ACPRfor reverse-channel WCDMA. Set the center fre-quency to 1950MHz with a +10dBm reference level.
8) The output power should be about +9dBm afteraccounting for cable and connector loss. The ACPRat ±5MHz offset should be -44dBc.
Adjustments and ControlVGA Adjust
Apply a voltage from 0.6V to 2.4V to header “VGC” toadjust the IF and RF VGA of the MAX2361/MAX2363/MAX2365. The VGC voltage is filtered on the EV kit tominimize undesired amplitude modulation.
Interface ControlThe interface port is designed to use a 20-pin ribboncable (Figure 1); 10 pins are signal lines, and the other10 pins are digital grounds. Pin 1 of the interface cableis red. Pin 1 is also designated in silk screen on each ofthe PC boards.
Detailed DescriptionThe following section covers the EV kits’ circuit blocksin detail (refer to the MAX2361/MAX2363/MAX2365data sheet for additional information).
I/Q InputsThe single-ended I/Q signals are converted to differen-tial by operational amplifiers on the EV kit. The op ampsalso provide DC bias to the I/Q input pins of theMAX2361/MAX2363/MAX2365. The EV kits are set up toprovide 415mVp-p differential to the IC when used witha 50Ω source that delivers 1Vp-p into 50Ω. For otherI/Q levels, replace R9 and R18 with appropriate resistorvalues according to Table 2.
Programming InterfaceThe programming interface is provided by theINTF2300 interface board. The interface board buffersand level shifts logic levels from the PC to theMAX2361/MAX2363W EV kits (refer to the INTF2300documentation). These logic signals control the logicpins as well as the serial interface.
CELLULARCDMA
UPPER-HALFBAND
PCS CDMAWCDMA
RFM (dec) 38214 58321 29125
RFR (dec) 656 656 192
IFM (dec) 6519 6519 4750
IFR (dec) 492 492 96
OPCTRL (hex) 090F 992F 9F0F
CONFIG (hex) C03F C03F D03F
ICCCTRL (hex) 0C38 2C38 2C38
TEST (hex) 100 100 100
Table 1. Register Settings
IFLOThe IFLO output port provides an output signal that iseither the IF VCO frequency or the VCO frequencydivided by 2, depending on the setting of the BUF_DIVcontrol bit. It can be enabled by setting the BUF_EN bitto 1 in the OPCTRL register.
TANK BYPThe tank bypass port is provided to drive the high-bandtank with an external LO source. The VCO_BYPASS bitshould be set to 1 to enable this port. Replace C25 with0.01µF AC-coupling capacitor; replace R36 and R70 with0Ω resistors; and remove R38, C12, C24, L10, D1, and D2.
REFREF is the reference frequency input to the RF and IFPLL. The REF port is AC-coupled. Make sure the refer-ence signal has low phase noise.
LOHLOH is the high-band RF LO input port. The EV kit isshipped with this port disconnected. To use this portwith an external signal source, disconnect the PCSVCO by removing C39 and placing it at location C66.
LOLLOL is the low-band RF LO input port. The EV kit isshipped with this port disconnected. To use this portwith an external signal source, disconnect the cellularVCO by removing C40 and placing it at location C65.
RFH1RFH1 is the PCS lower half-band PA driver output.Refer to Table 9 in the MAX2361/MAX2363/MAX2365data sheet for the mode description.
RFLRFL is the cellular band PA driver output. This port isactive in cellular and FM modes. Refer to Table 9 in theMAX2361/MAX2363/MAX2365 data sheet for the modedescription.
RFH0RFH0 is the PCS upper half-band PA driver output.Refer to Table 9 in the MAX2361/MAX2363/MAX2365data sheet for the mode description.
IFINH and IFOUTHFor cascade evaluation, an on-board filter is connectedbetween IFOUTH and IFINH. Select these ports by pro-gramming IF_SEL to 1. IFINH and IFOUTH are not con-nected to SMA connectors on the EV kit
IFINL and IFOUTLFor cascade evaluation, an on-board filter is connectedbetween IFOUTL and IFINL. Select these ports by pro-gramming IF_SEL to 0. For individual IF modulator andupconverter evaluation, remove R44, R49, R55, R58,and install R25, R33, R34, and R39 with 0Ω resistors.This connects the IFINL_ and IFOUTL_ pins to the IFINLand IFOUTL SMA connectors. The matching networksare tuned to 130MHz.
VBAT/VREGVBAT supplies VCC to the PA driver circuitry. This may bean unregulated battery voltage. The PA drivers are opencollector. Jumpers are provided to enable current mea-surement to each functional block of the IC (Table 3).VREG is connected to the output of the U2 regulator onthe EV Kit. Do not connect an external supply voltage toVREG header.
RBIASWhen resistor R73 is stuffed (typically 10kΩ), a bias volt-age may be applied to the RBIAS header to adjust thePA driver bias current. Internal to the IC, pin 12 is set to600mV. Output linearity or efficiency may be improvedby adjusting PA driver current.
Layout ConsiderationsThe MAX2361/MAX2363W EV kits can serve as guidesfor your board layout. Keep PC board trace lengths as
*Set R9 and R18 for different I/Q input-source level (basebandwaveform taken from the back panel of Agilent’s E4433B signalgenerator).
short as possible to minimize parasitics. Also, keepdecoupling capacitors as close to the IC as possiblewith a direct connection to the ground plane.
PC Board ConstructionThe MAX2361/MAX2363W EV kit PC board uses a 14mil-wide trace for 50Ω transmission line. The PC board has an8mil-layer profile on FR4 with a dielectric constant of 4.5.
INTF2300 SPI Interface BoardThe INTF2300 interface board is used to interface 3-wire SPI protocol from a PC’s parallel port to the EVkit. This board will level translate 5V logic from the PCto VCC of the EV kit (typically this will be 3.3V logic).The INTF2300 also provides buffering and EMI filtering.Its absolute maximum supply voltage is 4.6V, limited bythe breakdown of the buffer IC. The recommendedoperating supply voltage range is +2.7V to +3.6V.
Figure 3. MAX2361/MAX2363W EV Kit Component PlacementGuide—Component Side (Top View)
1.0"
Figure 4. MAX2361/MAX2363W EV Kit Component PlacementGuide—Solder Side (Bottom View)
1.0"
Figure 5. MAX2361/MAX2363W EV Kit PC Board Layout—Component Side (Top View)
1.0"
Figure 6. MAX2361/MAX2363W EV Kit PC Board Layout—Ground Plane (Top View)
1.0"
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MAX2361/MAX2363W Evaluation Kits
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13